Flood Warning Issued for Allen Vale: Groundwater Flooding Expected in Monkton Up Wimborne and Wimborne St Giles

Alert Details

The Environment Agency has issued a Flood Warning (Severity Level 2) for groundwater flooding in the Allen Vale. This alert indicates that high groundwater levels are expected to cause flooding in the region.

Affected Areas

The primary areas affected include Monkton Up Wimborne and Wimborne St Giles within the Dorset Council area of the Wessex region. The warning specifically identifies the Allen Vale and groundwater levels in Cranborne Chase as the sources of concern.

What You Should Do

Residents in the affected areas are advised to take the following actions:

• Prepare property resilience measures immediately.
• Ensure that any installed flood pumps are working and switched on.
• Identify alternative power sources for pumps in the event of a power cut.
• Be aware that septic tanks and sewer systems may experience inundation.
• Take particular care when driving, as flooding of roads is expected.
• Monitor local conditions as cellars in properties within the affected areas may experience flooding.

Expected Conditions

Groundwater levels in Cranborne Chase are currently falling slowly but remain high. The West Woodyates borehole is recorded at a level of 104.52m and is expected to stay elevated. While the region has seen a few days of drier weather, further rainfall is forecast to begin Thursday, February 26, which may cause groundwater levels to rise again through the weekend.

Timeline

The alert was officially raised on March 5, 2026. The Environment Agency is closely monitoring the situation and expects to provide an update by 2:00 PM on March 11, 2026, or sooner if conditions change significantly.